HAL has developed a specialised 'Flight Test Group' with expertise in trial installation of Avionic systems on Fixed and Rotary wings of Combat and Transport Aircraft. This group has achieved success in installing its latest Avionic systems on MiG-21 series, MiG-23, MiG-27M, MiG-29, IL-38, Su-30 MKI, HS 748, and TU-142 series of aircraft and also on helicopters like MI - 8, MI - 25, Seaking, Chetak and Cheetah. It has exhibited complete self-sufficiency for conducting feasibility studies, manufacturing of Mod Kits, Installation and Flight Testing of Avionic systems.

HAL has excellent facilities and procedures for defect investigation, repair and overhaul of Russian, Western and indigenous air-borne equipment. Our Engineers have vast experience in all these systems and  they also carry out  field repairs. The principle of Inspect and Repair As Necessary (IRAN) is followed, which means that the equipment need not be sent for regular / periodic overhaul. The repair facilities are available from first generation to fourth generation equipment with frequencies from DC to 40 GHz.